Rectifier arrangement

Abstract

A rectifier arrangement (20) for rectifying an AC voltage into a DC voltage has a first connection (21), a second connection (22), a third connection (23) and a fourth connection (24), which rectifier arrangement (20) has an intermediate circuit (50) with a first line (51), a second line (52) and a node point (53), which node point (53) is connected to the first line (51) via at least one first capacitor (61) and to the second line (52) via at least one second capacitor (62), which first connection (21), second connection (22) and third connection (23) are each connected to a star point (40) via an associated circuit arrangement (31, 32, 33), which fourth connection (24) is likewise connected to the star point (40), and which star point (40) is connected to the node point (53) via a controllable switch (45).

What is claimed is: 
     
       1. A rectifier arrangement for rectifying an AC voltage into a DC voltage, the rectifier arrangement comprising: a first connection, a second connection, a third connection and a fourth connection, the first connection, the second connection and the third connection of the rectifier arrangement being configured to be connected respectively to first, second and third phases of a supply grid, the fourth connection of the rectifier arrangement being configured to be connected to a neutral connector of the supply grid, the rectifier arrangement further having an intermediate circuit with a first line, a second line and a node point, the node point being connected to the first line via at least one first capacitor and to the second line via at least one second capacitor, the first connection, the second connection and the third connection are each connected to a star point via an associated circuit arrangement, the fourth connection also being connected to the star point, and the star point being connected to the node point via a controllable switch, the rectifier arrangement further having a control device configured to influence the controllable switch so that the control device switches the controllable switch into an on-state when the fourth connection is connected to the neutral conductor of the supply grid and so that the control device switches the controllable switch into an off-state under a condition that the fourth connection is not connected to the neutral conductor of the supply grid. 
     
     
       2. The rectifier arrangement of  claim 1 , wherein the circuit arrangements are each designed to allow a current between the circuit arrangement and at least one the first line and the second line. 
     
     
       3. The rectifier arrangement of  claim 1 , wherein the control device is designed to switch the controllable switch either into an on state or an off state during an entire rectification procedure on a connected supply grid. 
     
     
       4. The rectifier arrangement of  claim 1 , wherein the control device is designed to generate a first value that is dependent on the supply grid that is connected to the connections, and the control device is designed to influence the controllable switch depending on the first value. 
     
     
       5. The rectifier arrangement of  claim 4 , wherein the control device is designed to generate the first value by checking whether the fourth connection is connected to a neutral conductor. 
     
     
       6. The rectifier arrangement of  claim 4 , wherein the control device is designed to measure the potential at the fourth connection and to determine whether a neutral conductor is connected to the fourth connection on based on a temporal profile of the potential at the fourth connection. 
     
     
       7. The rectifier arrangement of  claim 1 , having a grid filter, which grid filter allows a leakage current. 
     
     
       8. The rectifier arrangement of  claim 1 , wherein the controllable switch is an electromechanical switch. 
     
     
       9. The rectifier arrangement of  claim 1 , wherein the controllable switch is a relay. 
     
     
       10. An electric vehicle or hybrid vehicle comprising the rectifier arrangement of  claim 1 . 
     
     
       11. The vehicle of  claim 10 , further comprising a plug connector for connecting a charging cable for the vehicle, and in which there is at least temporarily galvanic coupling between connections on the plug connector and the rectifier arrangement. 
     
     
       12. A rectifier arrangement for rectifying an AC voltage into a DC voltage, comprising:
 a first connection, a second connection, a third connection and a fourth connection, the first connection, the second connection and the third connection being configured to be connected to first, second and third phases of a supply grid, the fourth connection being configured to be connected to a neutral conductor of the supply grid; 
 an intermediate circuit having a first line, a second line and a node point, the first line and the second line being configured to be connected to a DC-to-DC voltage converter and through the DC-to-DC converter to a battery, the node point being connected to the first line via at least one first capacitor and to the second line via at least one second capacitor; 
 the first connection, the second connection and the third connection are each connected to a star point via respective circuit arrangements, each of the circuit arrangements further is connected to the first line and to the second line, the fourth connection further being connected to the star point, and the star point being connected to the node point via a controllable switch; 
 wherein each of the circuit arrangements is designed to allow a current between the circuit arrangement and at least one of the first line and the second line, and wherein to charge the capacitors, a current flows from the circuit arrangements to the first line and a current flows from the second line to the circuit arrangements thereby providing a higher potential in the first line than in the second line.